* {
    margin: 0;
    padding: 0;
}

body {
    position: fixed;
    width: 100%;
    height: 100%!important;
    overflow: hidden;
    font-family: "微软雅黑";
}

body #camera {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    width: 70%;
    height: 70%;
    background: red;
    // video{
    //     width: 200px;
    //     height: 300px;
    // }
    .changeCamera{
        position: absolute;
    top: 10%;
    z-index: 100;
    }
}